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Binary star in the constellation Monoceros
HD 50281
Observation data
Epoch J2000
Equinox J2000
Constellation
Monoceros
Right ascension
06h 52m 18.05045s
[1]
Declination
−05° 10′ 25.36617″
[1]
Apparent magnitude (V)
6.58
[2]
Characteristics
Evolutionary stage
main sequence
Spectral type
K3.5 V
[3]
B−V
color index
1.071± 0.008
[2]
Astrometry
Radial velocity (Rv ) −7.20± 0.15
[4] km/s
Proper motion (μ)
RA: −543.616
[1]
mas /
yr
Dec.: −3.491
[1]
mas /
yr
Parallax (π) 114.2968 ± 0.0465
mas
[1]
Distance 28.54 ± 0.01
ly (8.749 ± 0.004
pc )
Absolute magnitude (MV ) 6.87
[5]
Details
Mass 0.79
[6]
M ☉
Radius 0.73+0.01 −0.02
[1]
R ☉
Luminosity 0.225
[1]
L ☉
Surface gravity (log g ) 4.64
[6]
cgs
Temperature 4,712± 8.5
[7]
K
Metallicity [Fe/H]+0.01
[8]
dex
Rotational velocity (v sin i ) 5.5
[6] km/s
Age 1.88
[6]
Gyr
Other designations 88 G. Monocerotis,
BD −05°1844 ,
GJ 250,
HD 50281,
HIP 32984,
HR 2534,
SAO 133805,
WDS J06523−0510 ,
LFT 494,
LHS 1875,
LTT 2662
[9]
Database references
SIMBAD
A
B
HD 50281 is a
star in the
equatorial
constellation of
Monoceros . It is orange in hue with an
apparent visual magnitude of 6.58,
[2] which lies at or below the typical limit of visibility to the naked eye. The star is located at a distance of 28.5
light years from the
Sun based on
parallax , but is drifting closer with a
radial velocity of −7.2 km/s.
[4]
This object is an ordinary
K-type main-sequence star with a
stellar classification of K3.5 V.
[3] It is nearly two billion years old and is spinning with a
projected rotational velocity of 5.5 km/s.
[6] The
metallicity of this star – what astronomers term the abundance of elements with
atomic numbers greater than helium – is near solar. The star has 79%
[6] of the
mass of the Sun and 73%
[1] of the
Sun's radius . It is radiating 22.5%
[1] of the
luminosity of the Sun from its
photosphere at an
effective temperature of 4,712 K.
[7]
A magnitude 10.16
common proper motion companion,
[10] designated component B, is located at an
angular separation of 58.8
″ along a
position angle of 181° from the primary, as of 2015.
[10] This is a suspected binary star system
[11] with components of individual visual magnitude 10.6 and 11.1,
[10] and a class of M2.5 V.
[12] The coordinates of this companion are a source of
X-ray emission .
[13] A third companion, magnitude 14.04 component C, lies at a separation of 9.6″ from component B.
[10]
References
^
a
b
c
d
e
f
g
h
i
Brown, A. G. A. ; et al. (Gaia collaboration) (August 2018).
"Gaia Data Release 2: Summary of the contents and survey properties" .
Astronomy & Astrophysics . 616 . A1.
arXiv :
1804.09365 .
Bibcode :
2018A&A...616A...1G .
doi :
10.1051/0004-6361/201833051 .
Gaia DR2 record for this source at
VizieR .
^
a
b
c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331.
arXiv :
1108.4971 .
Bibcode :
2012AstL...38..331A .
doi :
10.1134/S1063773712050015 .
S2CID
119257644 .
^
a
b Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I". The Astronomical Journal . 132 (1): 161–170.
arXiv :
astro-ph/0603770 .
Bibcode :
2006AJ....132..161G .
doi :
10.1086/504637 .
S2CID
119476992 .
^
a
b Bailer-Jones, C.A.L.; et al. (2018). "New stellar encounters discovered in the second Gaia data release". Astronomy & Astrophysics . 616 : A37.
arXiv :
1805.07581 .
Bibcode :
2018A&A...616A..37B .
doi :
10.1051/0004-6361/201833456 .
S2CID
56269929 .
^ Holmberg, J.; et al. (July 2009). "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics". Astronomy and Astrophysics . 501 (3): 941–947.
arXiv :
0811.3982 .
Bibcode :
2009A&A...501..941H .
doi :
10.1051/0004-6361/200811191 .
S2CID
118577511 .
^
a
b
c
d
e
f Luck, R. Earle (January 2017).
"Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants" . The Astronomical Journal . 153 (1): 19.
arXiv :
1611.02897 .
Bibcode :
2017AJ....153...21L .
doi :
10.3847/1538-3881/153/1/21 .
S2CID
119511744 . 21.
^
a
b Kovtyukh, V. V.; et al. (2003). "High precision effective temperatures for 181 F-K dwarfs from line-depth ratios".
Astronomy and Astrophysics . 411 (3): 559–564.
arXiv :
astro-ph/0308429 .
Bibcode :
2003A&A...411..559K .
doi :
10.1051/0004-6361:20031378 .
S2CID
18478960 .
^ Rojas-Ayala, Bárbara; et al. (April 2012).
"Metallicity and Temperature Indicators in M Dwarf K-band Spectra: Testing New and Updated Calibrations with Observations of 133 Solar Neighborhood M Dwarfs" (PDF) . The Astrophysical Journal . 748 (2): 93.
arXiv :
1112.4567 .
Bibcode :
2012ApJ...748...93R .
doi :
10.1088/0004-637X/748/2/93 .
S2CID
41902340 .
^
"HD 50281" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2018-06-06 .
^
a
b
c
d Mason, B. D.; et al. (2014).
"The Washington Visual Double Star Catalog" . The Astronomical Journal . 122 (6): 3466–3471.
Bibcode :
2001AJ....122.3466M .
doi :
10.1086/323920 .
^ Mason, Brian D.; et al. (May 2018).
"Speckle Interferometry of Red Dwarf Stars" . The Astronomical Journal . 155 (5): 14.
arXiv :
1804.07845 .
Bibcode :
2018AJ....155..215M .
doi :
10.3847/1538-3881/aab9b8 .
S2CID
119267352 . 215.
^ Kirkpatrick, J. D.; et al. (1991).
"A standard stellar spectral sequence in the red/near-infrared - Classes K5 to M9" . Astrophysical Journal Supplement Series . 77 : 417.
Bibcode :
1991ApJS...77..417K .
doi :
10.1086/191611 .
^ Johnson, H. M. (April 1986). "An Unbiased X-Ray Sampling of Stars within 25 Parsecs of the Sun". Astrophysical Journal . 303 : 470.
Bibcode :
1986ApJ...303..470J .
doi :
10.1086/164092 .
hdl :
2060/19860004737 .
External links